Called my cell several times, Hangup with no message

Got a call from 818-650-3215 this afternoon.  When I didn't answer, a message was left from magic jace in my inbox mail.  When I enter the number in my search bar on the computer, it comes up as Temecula Valley Imaging.  Said I was due for an appointment and I should call 951-587-8956.  This is a legit phone number since I am due for a mammogram at Temecula Valley Imaging.

Recv'd 7 calls from this # earlier, showing 3 diff. CID's  ....  SHERMAN OAKS, their # only, & NAME NOT FOUND .....  finally left msg. on answr machine saying they were from a Med. Grp. I'd never heard of & I was to call another # to make an appt.  If real, poor way of doing business.

First part of recorded message cut off...something about rad-net???? And that I was due for an appt. I am not due for any appt. I will not be calling back.

Got a couple of calls saying I was due for an appointment,  this unknown place making appointments for the Long Beach area, when you call back phone rings twice and clicks off. Simply  I blocked the number.